CN215410105U - Gearbox with planet wheel bearing lubrication assembly - Google Patents

Abstract

The present invention provides a gearbox with a planetary wheel bearing lubrication assembly comprising: a planet carrier; the planetary wheel shafts are fixed on the planetary carrier; the bearings are respectively sleeved with the corresponding planet wheel shafts, the planet wheel shafts are provided with at least one guide oil way, the first ends of the guide oil ways deviate from the planet carrier, and the second ends of the guide oil ways are communicated between the bearings and the planet wheel shafts; the oil collecting device is fixed on the planet carrier and comprises an oil collecting ring body and a plurality of oil guide channels; the inner wall of the oil collecting ring body forms an oil collecting empty groove for collecting lubricating oil, the oil collecting empty grooves are respectively matched with corresponding planet wheel shafts, the first end of the oil guide channel is communicated with the first end of the guide oil way, the second end of the oil guide channel is communicated with the groove bottom through hole of the oil collecting empty groove, and when the oil collecting device rotates along with the planet carrier, the lubricating oil enters the groove bottom through hole and is sprayed to the first end of the guide oil way from the second end of the oil guide channel. The utility model can effectively avoid stirring loss and optimize the integral lubrication effect of the gear box.

Description

Gearbox with planet wheel bearing lubrication assembly

Technical Field

The present invention relates to the field of transmissions for electric drive systems, and in particular to gearboxes having a planetary wheel bearing lubrication assembly.

Background

Planetary gear sets (planetary gear trains), which are gear transmission mechanisms having many advantages such as small size, light weight, high carrying capacity, high power density, coaxial output, etc., are commonly used in reduction gearboxes and gear boxes, but the lubrication conditions are generally inferior compared to fixed-axis gear transmissions. When the planet row is applied to the traditional automobile, the rotating speed of each rotating part is not high, and the use requirement can be basically met by adopting oil bath splash lubrication; however, when the device is applied to a pure electric driving system, because the input rotating speed is very high, it is difficult to ensure that all rotating parts, especially the planet wheel bearing, are sufficiently lubricated and radiated.

CN109826942B discloses a lubricating mechanism for planetary gear train. Referring to fig. 1, the planet carrier 1 of the planet wheel 8 is provided with an axial hole 601 in the planet wheel shaft 6, and the oil collecting plate 4 is formed with a plurality of scoop-like oil collecting grooves 401, the oil collecting grooves 401 being positioned to be in fluid communication with the bearings of the respective planet wheels. The oil collecting groove 401 axially penetrates through the oil collecting plate 4, one side of the oil collecting plate 4 is communicated with the axial hole 601 of the planet wheel 8, the other side, far away from the planet wheel shaft 6, of the oil collecting plate is provided with the oil collecting plate baffle 3, the oil collecting baffle seals one side, far away from the planet wheel shaft, of the oil collecting groove 401, lubricating oil collected by the oil collecting groove is prevented from leaking from one side, far away from the axial hole, and therefore the lubricating oil can well enter the oil collecting groove 401. An oil collecting plate 4 is attached to the planet carrier of the planetary gear train (planetary reduction mechanism), and rotates together with the planet carrier. When one of the planets and its associated sump 401 rotate to a low position, the planet and sump 401 dip into the oil sump 11. The lubricating oil in the oil sump 11 is thus collected by the oil sump 401 during rotation of the planet carrier, and local pressure is built up at the oil sump, and the lubricating oil is squeezed to the axle of the planet wheels, thereby lubricating the axle bearings of the planet wheels.

A drawback of CN109826942B is that during operation of the planetary gear train, the planets are also immersed in the oil sump, and the oil sump covers an excessive part of the planet carrier, as shown in fig. 2. This can lead to churning losses and degradation of the performance and quality of the lubricating oil in electric drive applications (e.g., extremely high rotational speeds of vehicle drive motors).

Accordingly, the present invention provides a gearbox having a planetary wheel bearing lubrication assembly.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, the utility model aims to provide a gearbox with a planetary wheel bearing lubricating assembly, which overcomes the difficulties in the prior art, can effectively avoid stirring loss and the deterioration of the performance and quality of lubricating oil, optimizes the overall lubricating effect of the gearbox and prolongs the service life of products.

The present invention provides a gearbox with a planetary wheel bearing lubrication assembly, comprising:

a planet carrier;

the planetary wheel shafts are fixed on the planetary carrier and rotate with the planetary carrier;

the bearings are respectively sleeved with the corresponding planet wheel shafts, the planet wheel shafts are provided with at least one guide oil way, the first ends of the guide oil ways are deviated from the planet carrier, and the second ends of the guide oil ways are communicated between the bearings and the planet wheel shafts; and

the oil collecting device is fixed on the planet carrier and comprises an oil collecting ring body and a plurality of oil guide channels; the oil collecting device comprises an oil collecting ring body, wherein a plurality of oil collecting empty grooves for collecting lubricating oil are formed in the inner wall of the oil collecting ring body, each oil collecting empty groove is matched with the corresponding planetary wheel shaft, the first end of the oil guide channel is communicated with the first end of the oil guide way, the second end of the oil guide channel is communicated with the through hole in the bottom of the oil collecting empty groove, and when the oil collecting device rotates along with the planetary carrier, the lubricating oil enters the through hole in the bottom of the groove along the radial direction under the action of centrifugal force and is sprayed to the first end of the oil guide way from the second end of the oil guide channel.

Preferably, the oil collecting empty groove is crescent, and the adjacent oil collecting empty grooves are communicated with each other along the inner wall of the oil collecting ring body.

Preferably, the radius of a first circumference where the oil guide channel is located is larger than the radius of a second circumference where the groove bottom of the oil collection empty groove is located, with the axis of the oil collection ring body as a center.

Preferably, as the oil collecting device rotates, more lubricating oil flows from the oil collecting empty groove to the through hole of the groove bottom than to the adjacent oil collecting empty groove.

Preferably, the oil collecting device further comprises a plurality of screw bases which are in threaded connection with the planet carrier, and the screw bases and the oil guide channels are arranged at intervals along the periphery of the oil collecting ring body.

Preferably, the lubricating oil flows radially outward as it passes through the guide oil passage.

Preferably, the method further comprises the following steps:

an input shaft connected to or formed on a sun gear;

the planet wheels are respectively sleeved on the corresponding planet wheel shafts through the bearings;

a bearing cover fixed relative to the housing of the gearbox and provided with a bearing seat for a second bearing of the input shaft;

at least part of the planet carrier is submerged in the lubricating oil, and the planet carrier throws the lubricating oil towards the bearing cover of the second bearing of the input shaft when rotating towards the highest position.

Preferably, the bearing cover is provided with a drainage hole, and the lubricating oil flows to the position between the inner periphery of the bearing cover and the second bearing through the drainage hole under the action of gravity.

Preferably, the drainage hole is disposed above the second bearing to expose at least a portion of the second bearing.

Preferably, the bearing cover is further provided with a drainage groove parallel to the axial direction of the input shaft, and the drainage groove guides the lubricating oil to flow to the oil collecting empty groove of the oil collecting device.

Preferably, the oil collecting device includes annular first and second side walls and a circumferential wall connecting the first and second side walls on a radially outer side, the first side wall, the second side wall and the circumferential wall together defining the oil collecting empty groove, wherein the circumferential wall includes a plurality of radially convex portions and radially concave portions corresponding to the oil collecting empty groove, and the groove bottom through hole is formed in a region of the radially convex portions.

Preferably, the circumferential wall is formed by a number of arc-shaped wall sections, the number of arc-shaped wall sections corresponding to the number of oil collection recesses, and the radius of curvature of the arc-shaped wall sections is smaller than the radius of an imaginary circle passing through the recess bottom through hole.

The gear box with the planet wheel bearing lubricating assembly can effectively avoid stirring loss and the degradation of the performance and quality of lubricating oil, optimize the integral lubricating effect of the gear box and prolong the service life of products.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

FIG. 1 is a schematic view of a prior art planetary wheel bearing lubrication assembly.

FIG. 2 is a perspective view of a gearbox with a planetary wheel bearing lubrication assembly of the present invention.

FIG. 3 is a schematic view of a gearbox with a planetary wheel bearing lubrication assembly of the present invention.

Fig. 4 is a cross-sectional view taken along the line a-a in fig. 3.

Fig. 5 is an enlarged view of the region B in fig. 4.

Fig. 6 is an enlarged view of the region C in fig. 4.

FIG. 7 is a perspective view from a first perspective of an oil catcher in a gearbox having a planetary wheel bearing lubrication assembly in accordance with the present invention.

FIG. 8 is a perspective view from a second perspective of an oil catcher in a gearbox having a planetary wheel bearing lubrication assembly in accordance with the present invention.

FIG. 9 is a cross-sectional view of an oil trap in a gear box having a planetary wheel bearing lubrication assembly in accordance with the present invention.

FIG. 10 is a schematic of an oil trap in a gearbox with a planetary wheel bearing lubrication assembly of the present invention.

FIG. 11 is a perspective view of a bearing cap in a gearbox having a planetary wheel bearing lubrication assembly of the present invention.

FIG. 12 is a schematic view of a bearing cap guiding lubrication oil in a gearbox with a planetary wheel bearing lubrication assembly of the present invention.

FIG. 13 is a schematic illustration of the oil collection device in a gearbox having a planetary wheel bearing lubrication assembly of the present invention directing lubricating oil.

Reference numerals

1 Motor casing

2 second bearing

3 shaft seal

4 input shaft

5 bearing cap

51 drainage hole

52 drainage groove

6 sun gear

7 oil collecting device

71 oil collecting ring body

72 oil guide channel

73 screw base

74 oil collecting empty groove

75 groove bottom through hole

8 gear ring

9 planetary wheel shaft

91 leading oil path

10 planet carrier

11 gearbox casing

12 lock pin

13 dynamic oil level

14 bearing

15 planet wheel

16 screw

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.

In the description of the present invention, it is to be understood that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. To simplify the disclosure of the present invention, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

FIG. 2 is a perspective view of a gearbox with a planetary wheel bearing lubrication assembly of the present invention. FIG. 3 is a schematic view of a gearbox with a planetary wheel bearing lubrication assembly of the present invention. Fig. 4 is a cross-sectional view taken along the line a-a in fig. 3. Fig. 5 is an enlarged view of the region B in fig. 4. Fig. 6 is an enlarged view of the region C in fig. 4. FIG. 7 is a perspective view from a first perspective of an oil catcher in a gearbox having a planetary wheel bearing lubrication assembly in accordance with the present invention. FIG. 8 is a perspective view from a second perspective of an oil catcher in a gearbox having a planetary wheel bearing lubrication assembly in accordance with the present invention. FIG. 9 is a cross-sectional view of an oil trap in a gear box having a planetary wheel bearing lubrication assembly in accordance with the present invention. FIG. 10 is a schematic of an oil trap in a gearbox with a planetary wheel bearing lubrication assembly of the present invention. FIG. 11 is a perspective view of a bearing cap in a gearbox having a planetary wheel bearing lubrication assembly of the present invention. As shown in fig. 2 to 11, the gear box with the planetary wheel bearing lubrication assembly of the present invention comprises: a bearing cap 5, an oil collector 7, a planet wheel shaft 9, a planet carrier 10, a bearing 14 and a planet wheel 15. The planetary axles 9 are fixed on the planetary carrier 10 and rotate with the planetary carrier 10. The bearings 14 are respectively sleeved with the corresponding planet wheel shafts 9, the planet wheel shafts 9 are provided with at least one guide oil way 91, the first ends of the guide oil ways 91 are deviated from the planet carrier 10, and the second ends of the guide oil ways are communicated between the bearings 14 and the planet wheel shafts 9. The oil collecting device 7 is fixed on the planet carrier 10, and the oil collecting device 7 comprises an oil collecting ring body 71 and a plurality of oil guide channels 72. The inner wall of the oil collecting ring body 71 is provided with a plurality of oil collecting empty grooves 74 for collecting lubricating oil, each oil collecting empty groove 74 is matched with the corresponding planet wheel shaft 9, the first end of the oil guide channel 72 is communicated with the first end of the guide oil path 91, the second end of the oil guide channel 72 is communicated with the groove bottom through hole 75 of the oil collecting empty groove 74, and when the oil collecting device 7 rotates along with the planet carrier 10, the lubricating oil enters the groove bottom through hole 75 along the radial direction under the action of centrifugal force and then is sprayed to the first end of the guide oil path 91 from the second end of the oil guide channel 72. According to the utility model, through the coaxial rotation of the oil collecting device 7, lubricating oil which is drained from the bearing cover 5 by gravity is sprayed between the bearing 14 and the planet wheel shaft 9 through the guiding oil path 91 arranged on the planet wheel shaft 9, so that the bearing 14 and the planet wheel shaft 9 are lubricated.

In a preferred embodiment, the oil collection recesses 74 are crescent shaped, with adjacent oil collection recesses 74 communicating with each other along the inner wall of the oil collector body 71, such that the lubricating oil can flow between the different oil collection recesses 74 in cooperation with rotation and gravity, optimizing the lubricating effect.

In a preferred embodiment, the radius of the first circumference where the oil guide channel 72 is located is larger than the radius of the second circumference where the groove bottom of the oil collection empty groove 74 is located, with the axis of the oil collection ring body 71 as the center, so that more lubricating oil flows from the oil collection empty groove 74 to the groove bottom through hole 75 than to the adjacent oil collection empty groove 74 as the oil collecting device 7 rotates, and the lubricating effect is further optimized.

In a preferred embodiment, the oil collecting device 7 further includes a plurality of screw bases 73, which are screwed with the planet carrier 10, and the screw bases 73 and the oil guide channels 72 are arranged at intervals along the outer circumference of the oil collecting ring body 71.

In a preferred embodiment, as the lubricating oil passes through the guide oil path 91, the lubricating oil flows radially outward so as to be thrown from the first end to the second end of the guide oil path 91 by centrifugal force when the planetary shaft 9 rotates.

In a preferred embodiment, further comprising: an input shaft 4, a number of planet wheels 15 and a bearing cover 5. The input shaft 4 is connected to a sun gear or a sun gear is formed on the input shaft 4. The planet wheels 15 are respectively sleeved on the corresponding planet wheel shafts 9 through bearings 14. The bearing cover 5 is fixed relative to the housing of the gearbox and is provided with a bearing seat for the second bearing 2 of the input shaft 4. At least part of the planet carrier 10 is immersed in the lubricating oil, and the planet carrier 10 throws the lubricating oil toward the bearing cover 5 of the second bearing 2 of the input shaft 4 when rotating to the highest position, thereby transporting the lubricating oil from the bottom of the oil pool to the upper part of the bearing cover 5 of the second bearing 2 without causing churning loss.

In a preferred embodiment, the bearing cap 5 is provided with a drainage hole 51, and the lubricating oil flows by gravity through the drainage hole 51 toward between the inner periphery of the bearing cap 5 and the second bearing 2. The drainage hole 51 is provided above the second bearing 2 to expose at least a portion of the second bearing 2. The bearing cap 5 is also provided with a drainage groove 52 parallel to the axial direction of the input shaft 4, which guides the lubricating oil to the oil collection recess 74 of the oil collector 7. By using gravity, the lubricating oil enters the drainage groove 52 through the drainage hole 51 in the process of flowing down, and the lubricating oil flowing out of the drainage groove 52 directly enters the oil collecting empty groove 74 of the oil collecting ring body 71.

In addition, as shown in fig. 5 to 10, the oil catcher 7 includes annular first and second side walls that together define an oil collection space 74, and a circumferential wall connecting the first and second side walls on the radially outer side. As shown in particular in fig. 10, the circumferential wall comprises several radial projections and radial recesses corresponding to the oil collection empty grooves 74, the groove bottom through holes being formed in the region of the radial projections.

More specifically, the circumferential wall is constituted by a number (4 in the embodiment of fig. 10) of arc-shaped wall sections, the number of which corresponds to the number of oil collecting empty grooves, and the radius of curvature of the arc-shaped wall sections is smaller than the radius of an imaginary circle passing through the groove bottom through hole.

The specific embodiment of the utility model is as follows:

the gear box with the planet wheel bearing lubricating assembly is mainly applied to a planetary gear train running at a high speed, in particular to the planetary gear train in a reduction box of an electric drive system.

Referring to fig. 2 to 4, the electric drive system generally includes a motor module (left portion in fig. 4, disposed inside a motor housing 1) and a reduction gear box (gear box) module (right portion in fig. 4, disposed inside a gear box housing 11), and the input shaft 4 transmits power to a reduction mechanism in the reduction gear box. The reduction mechanism is typically a planetary gear train, and includes a sun gear 6, planetary gears 15 (4 in the example), a planetary carrier 10, and a ring gear 8. The sun gear 6 is coupled with the input shaft 4, and the ring gear 8 is fixed to the reduction case housing. The planet gears 15 are arranged in the radial direction between the sun gear 6 and the ring gear 8 and are rotatably fixed on the planet carrier 10 via planet gear shafts 9 (which are fixed on the planet carrier 10). A bearing 14 is provided between the planetary gear 15 and the planetary gear shaft 9 (in the present embodiment, the bearing 14 is a needle bearing, but not limited thereto). The planetary gear 15 is fixed to the planetary gear shaft 9 by the lock pin 12, and the planetary gear 15 also rotates while rotating with the planetary carrier 10.

Referring to fig. 3, an annular oil collector 7 is provided between the planet carrier 10 and the bearing cap 5 (or the second bearing 2 of the input shaft 4), which oil collector 7 is attached to the planet carrier 10 (for example by means of screws 16).

Referring to fig. 4, 5 and 6, the planet wheels 15, when rotating with the planet carrier 10 to the lowest position, will slightly soak under the dynamic level 13 of the lubricating oil and, when rotating to the highest position, will throw the lubricating oil by the action of centrifugal force towards the bearing cover 5 of the second bearing 2 of the input shaft 4, the outer circumference of the second bearing 2 being provided with a shaft seal 3. The lubricating oil will lubricate the second bearing 2 and then flow downwards by the action of gravity and into the cavities or oil collection areas (a 1, a2, A3, a4 in fig. 10) of the oil collection means 7. The respective cavities or oil collecting regions of the oil collecting device 7 communicate with the flow paths in the planetary wheel shaft 9 through the corresponding oil holes (H1, H2, H3, H4 in fig. 10), respectively, so that lubricating oil can pass through these flow paths to the bearings 14. The other figures show the oil catcher 7 and its assembled relationship to the bearing cap 5 and planet carrier 10.

Referring to fig. 7 to 10, the oil collection recesses 74 (oil collection areas formed by the concave cavity structure) a1, a2, A3, a4 of the oil collection device 7 of the present invention have a crescent shape. As shown in the right drawing of fig. 10, the diameter D1 of the first circumference where the oil holes H1, H2, H3, H4 of the four oil guide passages 72 are located is larger than the diameter D2 of the second circumference where the circumferential end positions of the cavities a1, a2, A3, a4 are located. When the oil collector 7 rotates together with the carrier, the lubricating oil stored in each cavity or oil collecting region tends to flow out (to the flow path in the planetary shaft) through the oil holes H1, H2, H3, H4 instead of flowing to the adjacent cavity or oil collecting region due to the crescent shape of the cavity or oil collecting region. And the oil collecting device 7 is utilized to fully lubricate the needle roller bearing of the planet wheel.

The overall flow of oil through the gearbox is described below with reference to fig. 12 and 13:

FIG. 12 is a schematic view of a bearing cap guiding lubrication oil in a gearbox with a planetary wheel bearing lubrication assembly of the present invention. Referring to fig. 12, when the input shaft 4 is rotating, at least a part of the planet carrier 10 is immersed in the lubricating oil, and the planet carrier 10 rotates toward the highest position, the lubricating oil is thrown toward the bearing cover 5 of the second bearing 2 of the input shaft 4. The lubricating oil reaching the surface of the bearing cap 5 flows downwards under the action of gravity, enters the drainage holes 51 to lubricate the second bearing 2, then flows downwards to enter the drainage grooves 52 continuously by utilizing the gravity, and the drainage grooves 52 guide the lubricating oil to directly flow to the oil collecting empty grooves 74 of the oil collecting ring body 71.

FIG. 13 is a schematic illustration of the oil collection device in a gearbox having a planetary wheel bearing lubrication assembly of the present invention directing lubricating oil. Referring to fig. 13, the oil collecting empty groove 74 collects the lubricating oil guided by gravity from the bearing cover 5, a first end of each oil guiding passage 72 is communicated with a first end of the oil guiding passage 91, a second end is communicated with the groove bottom through hole 75 of the oil collecting empty groove 74, and the lubricating oil enters the groove bottom through hole 75 along the radial direction by the centrifugal force as the input shaft 4 rotates, and then is sprayed from the second end of the oil guiding passage 72 to the first end of the oil guiding passage 91. According to the utility model, through the coaxial rotation of the oil collecting device 7, lubricating oil which is drained from the bearing cover 5 by gravity is sprayed between the bearing 14 and the planet wheel shaft 9 through the guiding oil path 91 arranged on the planet wheel shaft 9, so that the bearing 14 and the planet wheel shaft 9 are lubricated. The lubrication between the second bearing 2 and the bearing cover 5, and between the bearing 14 and the planet wheel shaft 9 is realized through the process, and because the structure (such as the scoop-type oil collecting empty groove 401 in the prior art) which needs to be immersed under the liquid level of the lubricating oil to generate stirring loss does not exist, the rotating speed of the utility model is higher, the working state is smoother, and the technical effect which cannot be realized by the prior art is achieved.

In conclusion, the gearbox with the planet wheel bearing lubricating assembly can effectively avoid stirring loss and the degradation of the performance and quality of lubricating oil, optimize the overall lubricating effect of the gearbox and prolong the service life of products.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims (12)

1. A gearbox having a planetary wheel bearing lubrication assembly, comprising:

a planet carrier (10);

a plurality of planet wheel shafts (9) which are fixed on the planet carrier (10) and rotate with the planet carrier (10);

the bearings (14) are sleeved with the corresponding planet wheel shafts (9), the planet wheel shafts (9) are provided with at least one guide oil way (91), the first ends of the guide oil ways (91) are away from the planet carrier (10), and the second ends of the guide oil ways are communicated between the bearings (14) and the planet wheel shafts (9); and

the oil collecting device (7) is fixed on the planet carrier (10), and the oil collecting device (7) comprises an oil collecting ring body (71) and a plurality of oil guide channels (72); the oil collecting ring body (71) is provided with a plurality of oil collecting empty grooves (74) for collecting lubricating oil on the inner wall, each oil collecting empty groove (74) is matched with the corresponding planet wheel shaft (9), the first end of the oil guide channel (72) is communicated with the first end of the guide oil way (91), the second end of the oil guide channel (72) is communicated with the groove bottom through hole (75) of the oil collecting empty groove (74), and when the oil collecting device (7) rotates along with the planet carrier (10), the lubricating oil enters the groove bottom through hole (75) along the radial direction under the action of centrifugal force and is sprayed to the first end of the guide oil way (91) from the second end of the oil guide channel (72).

2. The gearbox with a planet wheel bearing lubrication assembly as recited in claim 1, characterized in that the oil collection pockets (74) are crescent shaped, adjacent oil collection pockets (74) communicating with each other along the inner wall of the oil collection ring body (71).

3. The gearbox with a planetary wheel bearing lubrication assembly as set forth in claim 2, characterized in that the radius of a first circumference where the oil guide passage (72) is located is larger than the radius of a second circumference where the groove bottom of the oil collection empty groove (74) is located, with the axial center of the oil collection ring body (71) as a center.

4. A gearbox with a planetary wheel bearing lubrication assembly according to claim 3 in which more lubrication oil flows from the oil collection recess (74) to the groove bottom through hole (75) than to the adjacent oil collection recess (74) as the oil collection device (7) rotates.

5. The gearbox with a planetary wheel bearing lubrication assembly as set forth in claim 4, characterized in that the oil collecting device (7) further comprises a plurality of screw seats (73) screwed with the planet carrier (10), the screw seats (73) and the oil guide channel (72) being arranged at intervals along the outer circumference of the oil collecting ring body (71).

6. The gearbox with a planetary wheel bearing lubrication assembly as set forth in claim 1, characterized in that as the lubricating oil passes through said pilot oil passage (91), the lubricating oil flows radially outward.

7. The gearbox with planetary wheel bearing lubrication assembly according to any of claims 1 to 6, further comprising:

an input shaft (4) connected to a sun gear or a sun gear formed on the input shaft (4);

the planet wheels (15) are respectively sleeved on the corresponding planet wheel shafts (9) through the bearings (14);

a bearing cover (5), said bearing cover (5) being fixed relative to the housing of the gearbox and being provided with a bearing seat for a second bearing (2) of the input shaft (4);

at least part of the planet carrier (10) is immersed in the lubricating oil, the planet carrier (10) throwing lubricating oil towards the bearing cover (5) of the second bearing (2) of the input shaft (4) when rotating to the highest position.

8. Gearbox with planetary wheel bearing lubrication assembly according to claim 7, characterised in that the bearing cap (5) is provided with a drainage hole (51), through which drainage hole (51) lubricating oil flows by gravity between the inner periphery of the bearing cap (5) and the second bearing (2).

9. Gearbox with planetary wheel bearing lubrication assembly according to claim 8, characterised in that said drainage hole (51) is placed above said second bearing (2), exposing at least part of the second bearing (2).

10. Gearbox with epicyclic bearing lubrication assembly according to claim 9, wherein said bearing cap (5) is further provided with a drainage groove (52) parallel to the axial direction of said input shaft (4), guiding said lubricating oil towards an oil collection void (74) of said oil collection means (7).

11. Gearbox with a planet wheel bearing lubrication assembly according to claim 1, characterised in that the oil catcher (7) comprises annular first and second side walls and a circumferential wall connecting the first and second side walls on the radially outer side, which first, second and circumferential wall together define the oil collecting void (74), wherein the circumferential wall comprises a number of radial protrusions and radial recesses corresponding to the oil collecting void (74), the groove bottom through hole (75) being formed in the area of the radial protrusions.

12. The gearbox with a planet wheel bearing lubrication assembly as set forth in claim 11, characterized in that said circumferential wall is made up of a number of arc-shaped wall segments corresponding to the number of oil collection empty slots (74), and the radius of curvature of said arc-shaped wall segments is smaller than the radius of an imaginary circle passing through said slot bottom through hole (75).

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